Cylinder lock



E. N. JACOBl CYLINDER LOCK Oct. 26, 193 7.

2 Sheets-Sheet 1 Filed June 5, 19.36

a jimi/"i N M2750@ Oct. 26, 1937. E. N. JAcoBl I' l 2,097,192

v CYLINDER LOCK Filed June 5, 1936l 2 Sheets-Sheet 2 y Edward-N Jim@ aaw- Patented Oct. 26, 1937 UNITED STATES PATENT OFFICE CYLINDER LOCK Edward N. Jacobi, Milwaukee, Wis., assignor toy Briggs & Stratton Corporation, Milwaukee, Wis., a corporation of Delaware vApplication June 5, 1936, Serial No. 83,677

6 Claims. (Cl. 'Z0-368) It is an object of this invention to provide a gage with a locking bar 'I' and project the same lock in which removal of the cylinder is posiinto one of a pair of longitudinal grooves B tively prevented as long as the cylinder is not formed in the wall of the bore 6 for securing the turned beyond its normal limits of rotation, and cylinder against rotation.

5 to provide novel means for defining the normal The tumblers are retractable within the cylinlimits of rotation, which means may be disabled dei by e key 9 inSerable into the keyWe'y |0- to allow rotation of the cylinder to a releasing Uilen retI'aCl'fiOn 0f the tumblers the Cylinder iS position. n freed for rotation within predetermined limits de- Another object f this invention is to provide ned in the manner to be hereinafter described,

l0 releasable means for defining the limits of rotaand as long as the cylinder is not turned beyond 10 tion of the cylinder which may be released by a these limits, il? iS DOSiiVely held against Withtool inserted endwise into the cylinder from the dreWal from the Cylinden front end thereof, The means for securing the cylinder against A further Object of this invention is to provide withdrawal comprises two circumferentially l moans for positiven holding the cylinder against spaced lues H extending radially in from the Wall 15 withdrawal and for deiining the normal limits of 0f a ellntelbOYe l2 fOlnled at the Outer end of rotation of the cylinder, so associated thatv a the Casing and in WlliCl'l 21 heed i3 0n the Cylinsingle element is common to both of said means. der iS diSnOSed, and a StOp member l5 Carried with me above and other objects in View which by the Cylinder 1- The lugs Il together form e will appear as the description proceeds, this in- Shoulder' 0i ledge in beek 0f Which tWo Crleurn- 20 vention resides in the novel construction, combifelenially spaced Cylinder carried lugs I4 engage. nation and arrangement of parts substantially as AS 1011 aS any pOll'fiOn of the lugs I4 is engaged hereinafter described and more particularly dein back O the lugs H the cylmde' is prevented ned by the appended claims, it being understood from OllilWafd Withdrawal, but upon being turned that such changes in the precise embodiment of to a withdrawing position, as shown in Figure 5, 25 the hereindisclosed invention may be made as at which both lugs I4 are disengaged from the come within the scope of the claims. lugs I I, the cylinder is free for withdrawal.

The accompanying drawings illustrate one The normal limits of rotation of the cylinder complete example of the physical embodiment of are defined by the engagement of the stop mem- 80 the invention constructed according to the best bei' l5 Carried by the cylinder imth the outer ends 30 mode so far devised for the practical application l5 and ll O illelllgs ll- The SOD member i5 oi the principles thereof, and in which: has asubstantially T-shaped cross section andk is Figure 1 is a view partly in side elevation and axially slidable in a correspondingly shaped partly in longitudinal section showing a lock emgroove I8 formed in the front end of the cylinbodying this invention; der, the stem of its T-shaped body projecting 35 Figure 2 is a front end View of the lock with from the cylindrical surface of the cylinder to coiparts broken away and the key in section; act with the ends of the lugs I6 and I'I in limit- Figure 3 is a cross sectional View taken through ing the rotation of the cylinder. Figure 1 on the plane of the line 3 3; An expansive spring I9 having its opposite ends Figure 4 is a View similar to Figure 1, but showreceived in pockets 2i! and ZI formed respectively 40 ing the manner of releasing the rotation limiting in the bottom of the slot IB and the inner end of means; the stop member yieldingly urges the stop mem- Figure 5 is a cross section View similar to Figure ber outwardly of the cylinder to its operative 3, but with the cylinder turned to its withdrawposition. The forward motion of the stop meming position; ber induced by the spring I9 is limited by the 45 Figure 6 is a perspective view of the front end engagement of the forward end of the stop memof the lock casing; and ber with the inner wall of a finishing cap 22 se- Figure '7 is a perspective View of the cylinder cured over the head I3 of the cylinder. looking forwardly from the rear end thereof. This cap has a hole 23 in line with the stop Referring now particularly to the accompanymember through which a wire may be inserted 50 ing drawings in which like numerals indicate like to push back the stop member out of circumparts throughout the several views, the numeral 5 ferential alignment with the lugs I I permitting designatesa casing or mounting member which is the cylinder to be turned beyond its normal bored as at 6 to receive a lock cylinder l. The limits of rotation to a position shown in Figure 5.

cylinder 1, is equipped with tumblers which en- When so positioned, the stop member aligns with 55 use of a proper key is necessary to effect withdrawal of the cylinder as the cylinder must be turned out of its locked position to place the same Y in its withdrawing position. Y

From the foregoing description taken in connection with the accompanying drawings, it will be readily apparent to those skilled in the art to which this invention appertains that this invention provides a simple and effective manner of removably securing a lock cylinder in its casing.

What I claim as my invention is:

1. In a lock, a bored casing, a cylinder rotatable therein between predetermined normal limits upon the insertion of a proper key, means for positively preventing withdrawal of the cylinder except when the samehas been turned to a predetermined position which lies beyond said normal limits, and means for dening the normal limits of rotation of the cylinder comprising circumferentially spaced abutments on the casing, and a yieldable stop member carried by the cylinder and normally retained in a position transversely aligned with said abutments to be engageable therewith and movable axially of the cylinder to free the cylinder for rotation beyond said limits of rotation.

2. In a lock, a bored casing, a lock cylinder rotatable therein, and means for dening the normal limits of rotation of the cylinder comprising spaced abutments carried by the casing and projecting' inwardly from the bore thereof, and a yieldable stop member carried by the cylinder andv normally held in a position trans- -versely aligned with the abutments to be engageable therewith and movable inwardly in a direction parallel withthe axis of the lock to free the cylinder for movement past its predetermined limits of rotation. Y

3. In a lock, a bored casing, a lock cylinder rotatable therein, and means for deining the normal limits of rotation of the cylinder comprising circumferentially spaced abutments projecting inwardly from the wall of the casing bore, and a movable stop member slidable axially in a slot in the cylinder with a portion thereoi` projecting from the side wall Ythereof for coaction with said spaced abutments, a spring acting on the stop member to hold the same in its operative position at which it is aligned with spaced abutments, and a front wall for the cylinder closing the slot in the cylinder in which said stop member slides to limit the move- :an undercut open slot in its front end portion opening'to its side wall, a movable stop member slidable in said slot with a part thereof projecting from ther cylinder side wall to cooperate with the spaced abutments, and means yieldingly maintaining said stop member in its operative position from which it is movable to disalign the Y same with said spaced lugs and free the cylinder for rotation beyond its normal limits.

5. In a lock, a bored casing having a counterbore, a lock cylinder rotatable in the bore, a head on the cylinder disposed in the counterbore, means for dening thernormal limits of rotation for the cylinder comprising circumferentially spaced but transversely aligned lugs projecting in from the wall of the counterbore inwardly of the cylinder head, the cylinder having an undercut slot in its front end portion extending through the head and opening to the side of the cylinder, a movable stop member slidably disposed in said slot and having a part projecting therefrom for coaction with the spaced abutments, a, spring yieldingly urging the stop member outwardly toward the front of the cylinder, and a finishing shell covering the head of the cylinder and closing the open front end of the slot to limit the outward movement of the stop member by its spring, and said shell having a hole through which a tool may beinserted for pushing the stop member inwardly to disalign the same with said spaced lugsand free the cylinder for rotation beyond its normal limits.

6. In a lock, a bored casing, a lock cylinder rotatable therein, a lug projecting inwardly from the wall of the casing bore, a flange on the cylinder engaging in back of the lug to prevent withdrawal of the cylinder as long as the ange is engaged with said lug, said flange being disengageable from rthe lug upon rotation of the cylinder to a predetermined position, and a releasable stop member normally transversely aligned with the lug to beengageable with the end of the lug for normally preventing rotation of the cylinder to said predetermined position, said stop member being movable axially of the cylinder and transversely to the lug out of transverse alignment with the lug to free the cylinder for rotation to said predetermined position.

EDWARD N. JACOBI.

Cil 

